POSITIVE-DISPLACEMENT PUMP Russian patent published in 1995 - IPC

FIELD: pump engineering. SUBSTANCE: working chamber is constructed as bellows made of material having inverse-heat shape memory. The working chamber has movable and fixed face walls. Heating members are arranged symmetrically at a distance from each other on sides of the bellows along its longitudinal axis. The central straight-stroke guide rod is rigidly secured at the center of the movable face wall. The rod has two sliding bearing. One of the bearings is positioned inside the bellows and the other one is positioned outside the bellows. A part of the rod has the through outlet end which is kinematically coupled with the switch for switching the heating members. EFFECT: enhanced efficiency. 2 dwg